The nightmare of each every woman
The nightmare of every woman is meeting someone who is wearing exactly the same outfit as her she. I think at least once it has happened to everybody at least once.
As children we even tried to wear the same shoes or dresses. It gave us a sense of brotherhood. But that is quite different when you are not/no longer a child.
The ultimate/[top of] horror is a situation when you are in at a special event, where you’re going to be, if not exactly the queen, (but) at least to be a duchess. Just imagine only: you’ve spent a lot of time on at the hairdresser, you’ve bought a dress that costs a bomb/a fortune as a plain, and you’ve done everything/all for to looking amazing. . and just at the moment when you’re going to bowl over/slay all the guests with your appearance/[look], you notice someone who hasd the nerve/cheek/[face] to wear the same as you. Though the dress doesn’t fit on this pompous dumb blonde, but it’s clear that the party is irretrievably ruined.
<em>OMG, the trials and tribulations of women; thank God I'm spared these !</em>